What is N-Acetylcysteine (NAC)? N-Acetylcysteine (NAC) is a powerful nootropic and glutathione precursor derived from the amino acid L-cysteine. How does N-Acetylcysteine (NAC) work? N-Acetylcysteine is a glutathione precursor. What that means is that when ingested, N-Acetylcysteine is converted into glutathione in your body. Glutathione is an extremely powerful antioxidant that is used by your liver to detoxify your body. NAC enables more glutathione to be produced when it would normally be depleted. Through glutathione buffering, NAC provides antioxidative effects and other benefits. Benefits of N-Acetylcysteine (NAC) NAC is a natural detoxifier of the body. It is often used as the primary treatment to counteract acetaminophen and carbon monoxide poisoning. There is evidence of NAC being helpful in fighting off a variety of infections and illnesses including bronchitis and the flu. Taking NAC has also shown to be effective in preventing excess liver damage due to alcoholism. Why use N-Acetylcysteine (NAC)? Detoxifies your body Reduces depression Reduces anxiety Reduces symptoms of OCD How to use N-Acetylcysteine (NAC)? N-A-C typically comes in capsules containing 500 – 600 mg each. Successful studies have shown consumption of 1 – 2 grams (2 – 4 capsules) per day to be effective. Possible Side Effects of N-A-C N-A-C typically does not produce any significant side effects. However it can in some cases cause nausea, vomiting, diarrhea, or constipation. Rarely, it can cause rashes, fever, headache, drowsiness, low blood pressure, and liver problems.